Definitions :
1. A large vagina.
2. A vagina that is deeper and wider than average.
3. A vagina that has greater internal volume than most men are used to having intercourse with.
4. A big pussy.

Ways to tell if a woman has a walk-in-pussy :
1. You can clearly see the space in between the walls when she's bent over in doggy style. Before, during and after sexual intercourse.
2. These types of pussy tend to queef more.
3. The women who have these larger vaginas tend to not moan or scream as much. Many can be totally silent throughout the entire intercourse.
4. These types of women appear to handle rougher sex better than average.

Origin of the term :
The term comes from the fact that some womens vaginas are so large. That the man literally can go back inside her using only his hips to direct his penis into her vagina and start thrusting again. Hence, walking into her pussy = Walk-in-pussy.